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- Wang, JinHebei University of Technology (author)
Effects of pin fins and vortex generators on thermal performance in a microchannel with Al2O3 nanofluids
- Article/chapterEnglish2022
Publisher, publication year, extent ...
- Elsevier BV,2022
Numbers
- LIBRIS-ID:oai:lup.lub.lu.se:4e85a8f0-aaec-4cc9-81fd-9e5905983fa8
- https://lup.lub.lu.se/record/4e85a8f0-aaec-4cc9-81fd-9e5905983fa8URI
- https://doi.org/10.1016/j.energy.2021.122606DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- This paper performs a comparative analysis to obtain the optimal cross-section shape and parameters of both pin fins and vortex generators. A novel combined structure with pin fins and vortex generators is proposed to enhance thermal performance of an integrated microchannel heat sink. Effects of nanoparticle diameter and volume fraction are investigated using Al2O3 nanofluid and DI-water as working fluid. Pin fins and vortex generators cause enhancements of flow disturbance and heat transfer on microchannel heat sinks. Results indicate that oval pin fins have better improvements of thermal/hydraulic performance compared to round and diamond pin fins. The oval pin fin with 0.4 mm spacing and 0.1 mm height presents the highest overall performance factor in the Reynolds number range of 340–640. Presence of vortices intensifies the mixing of the hot fluid near bottom surface and cold fluid near top surface. The optimal vortex generator with length of 0.08 mm and height of 0.06 mm provides a 30% increase in overall performance factor compared to the rectangular microchannel at Reynolds number of 340. Mechanism of heat transfer enhancement is analyzed by investigating flow velocity, temperature distribution and field synergy angle distribution in microchannels. Based on the field synergy principle, it is found that a small and uniformly distributed synergy angle is achieved in the integrated microchannel. According to comparisons of the overall performance factor and total thermal resistance, the optimal nanoparticle diameter and Al2O3 volume fraction of nanofluids are 20 nm and 4%, respectively.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
- Field synergy
- Microchannel
- Nanofluid
- Pin fin
- Vortex generator
Added entries (persons, corporate bodies, meetings, titles ...)
- Yu, KaiHebei University of Technology (author)
- Ye, MingzhengHebei University of Technology (author)
- Wang, EnyuHebei University of Technology (author)
- Wang, WeiHebei University of Technology(Swepub:lu)we1577wa (author)
- Sundén, BengtLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Värmeöverföring,Institutionen för energivetenskaper,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Heat Transfer,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)vok-bsu (author)
- Hebei University of TechnologyNanoLund: Centre for Nanoscience (creator_code:org_t)
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- In:Energy: Elsevier BV2390360-5442
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